add tcp_option

templates/haproxy_frontend_rule.erb

@@ -1,8 +1,13 @@
 <% if @fqdn == @haproxy_fqdn -%>
+<% if @frontend_name != '' -%>
 frontend      <%= @frontend_name %>
+<% end -%>
+<% if @frontend_mode != '' -%>
 mode          <%= @frontend_mode %>
+<% end -%>
+<% if @fe_bind_mode != '' -%>
 bind          <%= @fe_bind_mode %>
-
+<% end -%>
 <% if @fe_maxconn != '' -%>
 maxconn       <%= @fe_maxconn %>
 <% end -%>